4.10. /usr/sbin : Non-essential standard system binaries

4.10.1. Purpose

This directory contains any non-essential binaries used
exclusively by the system administrator. System administration
programs that are required for system repair, system recovery,
mounting /usr, or other essential functions must
be placed in /sbin instead.
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4.10.2. Requirements

There must be no subdirectories in /usr/sbin.

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Locally installed system administration programs should be placed in
/usr/local/sbin.